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gpu: nvgpu: add and use sw-only timers

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The nvgpu timeout API has an internal override for presilicon mode by
default: in presi simulation environments the timeouts never trigger.
This behaviour is intended in the original usecase of the timer unit
with hardware polling loops. In pure software logic though, the timer
must trigger after the specified timeout even in presi mode so add a new
init function to produce a timer for software logic. Use this new kind
of timer in channel and scheduling worker threads.

The channel worker currently times out for just the purpose of the
channel watchdog timer which has its own internal timer. Although that's
just software, the general expectation is that the watchdog does not
trigger in presilicon tests that run slower than usual. The internal
watchdog timer thus keeps the non-sw mode.

Bug 3521828

Change-Id: I48ae8522c7ce2346a930e766528d8b64195f81d8
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2662541
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Konsta Hölttä
2022-02-01 15:59:42 +02:00
committed by mobile promotions
parent 621417bc73
commit 8736c0d467
7 changed files with 53 additions and 11 deletions
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12
drivers/gpu/nvgpu/os/linux/timers.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2016-2021, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -45,6 +45,16 @@ void nvgpu_timeout_init_cpu_timer(struct gk20a *g, struct nvgpu_timeout *timeout
nvgpu_assert(err == 0);
}
void nvgpu_timeout_init_cpu_timer_sw(struct gk20a *g, struct nvgpu_timeout *timeout,
u32 duration_ms)
{
int err = nvgpu_timeout_init_flags(g, timeout, duration_ms,
NVGPU_TIMER_CPU_TIMER |
NVGPU_TIMER_NO_PRE_SI);
nvgpu_assert(err == 0);
}
void nvgpu_timeout_init_retry(struct gk20a *g, struct nvgpu_timeout *timeout,
u32 duration_count)
{